1500mm ID Akkerman Open-Face Drum Digger TBM

The 1500mm ID Akkerman Drum Digger is an open face TBM where the cutting head is rotated inside the main shield with bearings between the outer skin and the inner rotating 'drum'. The cutting head is a bar or cross across the face of the drum equipped with carbide teeth to suit the ground conditions. It is a very simple design and cuts to the exact shape of the pipe/tunnel so that the shield edge does not have to cut the ground. It is faster than a backactor in the right ground and when equipped with point attack teeth will cut much harder ground than a backactor.

This machine is ideal for stiff clays. The excavated material is loaded into skips using a conveyor belt or an auger (for soft ground) in much the same way as a backactor. Skips are usually winched out on a pipe bogie or rails. Pit requirements are similar to a backactor shield, 6 to 7metres depending on the type of jacking rig used. Lengths of drive are only limited because of access for the driver at the face (300m for a 1.5ID machine) and time to remove skips.

1500mm ID Akkerman Open-Face Drum Digger TBM

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